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Synthetic method of resin for hard melamine foam material

A technology of melamine and foaming materials, which is applied in the field of polymer materials, can solve the problems of poor stability of melamine resin, and achieve the effect of preventing the resin from cross-linking too fast, uniform performance, and favorable storage and utilization

Active Publication Date: 2014-03-26
HOLITECH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the poor stability of ordinary melamine resin, the stability, molecular weight and viscosity of the final resin have a significant impact on later use

Method used

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  • Synthetic method of resin for hard melamine foam material
  • Synthetic method of resin for hard melamine foam material
  • Synthetic method of resin for hard melamine foam material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) At pH 9.0 and temperature 80°C, 1 mol of melamine and 2.5 mol of paraformaldehyde undergo methylolation reaction in 6.0 mol of water as solvent for 1.2 hours to generate polyhydroxy melamine;

[0026] (2) Add formic acid to polyhydroxymelamine to adjust the pH to 5.5, then add ethanol, the mass ratio of ethanol to polyhydroxymelamine is 0.02:1, the reaction temperature is 80°C, and the reaction time is 1.0h, a three-dimensional network polymerization reaction occurs, A resin for a rigid melamine foam material was obtained.

[0027] Add foaming agent, curing agent, and emulsifier to the prepared rigid melamine foaming material resin, wherein the foaming agent, curing agent, and emulsifier are conventional products in the field. foam to obtain a rigid foam material. The performance test is as follows:

[0028]

Embodiment 2

[0030] (1) Under the conditions of pH 8.0 and temperature 85°C, 1 mol of melamine and 1.5 mol of paraformaldehyde undergo a methylolation reaction in 5.5 mol of water as a solvent for 1.5 hours to generate polyhydroxy melamine;

[0031] (2) Add p-toluenesulfonic acid to polyhydroxymelamine to adjust the pH to 6.0, then add polyethylene glycol 400, the mass ratio of polyethylene glycol 400 to polyhydroxymelamine is 0.05:1, the reaction temperature is 90°C, and the reaction time is After 0.8h, a three-dimensional network polymerization reaction occurs to obtain a resin for rigid melamine foaming materials.

[0032] Add foaming agent, curing agent, and emulsifier to the prepared rigid melamine foaming material resin, wherein the foaming agent, curing agent, and emulsifier are conventional products in the field. foam to obtain a rigid foam material. The performance test is as follows:

[0033]

[0034]

Embodiment 3

[0036] (1) At pH 8.5 and temperature 90°C, 1 mol of melamine and 4.0 mol of paraformaldehyde undergo methylolation reaction in 6.5 mol of water as solvent for 1.8 hours to generate polyhydroxy melamine;

[0037] (2) Add citric acid to polyhydroxymelamine to adjust the pH to 7.0, then add ethylene glycol, the mass ratio of ethylene glycol to polyhydroxymelamine is 0.04:1, the reaction temperature is 85°C, and the reaction time is 1.2h, three-dimensional Reticular polymerization reaction to obtain a resin for rigid melamine foaming materials.

[0038] Add foaming agent, curing agent, and emulsifier to the prepared rigid melamine foaming material resin, wherein the foaming agent, curing agent, and emulsifier are conventional products in the field. foam to obtain a rigid foam material. The performance test is as follows:

[0039]

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Abstract

The invention belongs to the field of polymer materials, and in particular relates to a synthetic method of a resin using a hard melamine foam material. The method is as below: conducting a hydroxymethylation reaction on melamine and formaldehyde in with a solvent of water at the pH of 8.0-9.0 to generate polyhydroxy melamine; adding acid into the polyhydroxy melamine to adjust the pH value to 5.5-7.0, and adding alcohol to carry out a three-dimensional network polymerization. The alcohol is one or a mixture of methanol, ethanol, ethylene glycol and polyethylene glycol 400. According to the invention, the polyhydroxy melamine is added with acid and then alcohol, so that the resin gains good stability to facilitate storage and utilization. By adjusting the proportion of melamine and formaldehyde and controlling the reaction conditions, the obtained resin has uniform molecular weight. Weak acid conditions are employed to control the speed of a resin cross-linking reaction, so as to effectively prevent the problem that the resin coagulates into a block due to fast cross-linking.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a resin synthesis method for rigid melamine foaming materials. technical background [0002] Melamine resin is a traditional amino resin, melamine formaldehyde resin can be used stably at 150°C, and has self-extinguishing, arc resistance and good mechanical properties. At present, melamine formaldehyde resin is mainly used in wood processing, molding agent, coating, water reducing agent, leather finishing agent and so on. [0003] Melamine resin is used to prepare fireproof foam plastics. In addition to lower bulk density and chemical corrosion resistance than other foam plastics, melamine foam plastics have outstanding sound absorption, especially low-frequency noise absorption characteristics, and outstanding thermal stability. And aging resistance, outstanding flame retardancy, low smoke and hygiene. The outstanding post-processing not only enhances its inherent ...

Claims

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Application Information

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IPC IPC(8): C08G12/32
Inventor 赵大学徐国磊王宜明刘竹庆高修家
Owner HOLITECH TECH CO LTD
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